Edward albert davies



(No Model.)

E. A. DAVIES. PROCESS OF GALVANIZING PLATES. 4 No. 425,661. Patented Apr. 15, 1890.

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UNITED STATES PATENT OFFICE.

EDNVARD ALBERT DAVIES, OF IVOLVERHAMPTON, COUNTY OF STAFFORD, ENGLAND, ASSIGNOR TO THE DAVIES BROTHERS & CO, (LIMITED,) OF

SAME PLACE.

PROCESS OF GALVANIZING PLATES.

SPECIFICATION forming part of Letters Patent No. 425,661, dated April 15, 1890.

Application filed July 3, 1889. Serial No. 316,454. (No model.)

To all whont it may concern:

Be it known that I, EDWARD ALBERT DA- VIES, galvanized-iron manufacturer, a subject of the Queen of Great Britain,residing at Volverhampton ,inthecountyof Stafford,England, have invented certainnew andusefulImprovements in Preparing Iron and Steel Sheets or Plates Previously to Galvanizing Them, (that is, coating them with spelter;) and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

In the art or process of galvanizing iron and steel sheets or plates as heretofore practiced they are first pickled, then washed in water, and finally dipped in a bath containing the molten spelter, which adheres to them on their removal from the bath and forms a permanent coating, which protects the iron or steel The pickling produces a roughened surface on the sheets or plates, and the portions of the spelter which fill up the pits or hollows in the surface are to a large extent wasted, and as spelter is an expensive metal a considerable loss results. Moreover, owing to the roughness of the pickled surface, the surface of the coating which is formed thereon by the galvanizing process is not so smooth as is desirable.

Now the object of this invention is to overcome these defects, (at least in a very considerable degree,) and this is accomplished by cold-rolling the iron or steel sheets or plates subsequently to pickling them inthe usual manner and previously to coating them in the bath of molten metal,the sheets being kept wet between the pickling and cold-rollin g and between the cold-rolling and their immersion in the bath of molten metal. The sheets or plates are kept underwater after being pickled until they are passed through the cold-rolls, so as to avoid oxidation by the atmosphere, and for the same purpose they are kept under water after rolling until they are dipped in the galvanizing=bath. The sheets or plates should be exposed as little as possible to the influence of the atmosphere between the pickling and dipping processes, and the rolls are supplied with water, so that the sheets or plates may be kept wet during the rolling process.

As freshly-pickled sheets or plates may require to be washed before all the previously pickled-and washed sheets or plates have been 5 5 cold-rolled, it is convenient to store the pickled and washed sheets or plates in a bath of water, to which they are moved from the washing-bath, and this storing-bath maybe placed With one end just in front of the rolls, so that the sheets or plates contained in such bath are conveniently fed therefrom to the rolls. The sheets or plates are placed in a corresponding storing-bath immediately after passin gthrough the rolls, where they remain until drawn out for dipping into the molten coating metal.

In order to keep the work separate, aseparate storing-bath for receiving the sheets or plates from the rolls may be used for each galvanizing-pot; but a common storing-bath for receiving the pickled and Washed sheets or plates previously to cold-rolling them may be employed, as the sheets or plates from one washing-bath may be rolled before those of another washing need to be removed from the bath in which they are washed. The coldrolling appears to have the effect of closing up the pores or cells which have been formed in the substance of the metal by the action of the acid employed in pickling, and it produces a much smoother surface than is left as a result of the pickling.

There is nothing special in the apparatus employed. The rolls are of the usual charac- 8 5 ter of rolls employed for cold-rolling metal, and are operated in the same or analogous manner. The rolls may be immersed in the bath of water within which the sheet or plates are stored previously to being cold- 0 rolled, if desired, so that the rolling is performed entirely under water. In such case the rolls may be carried and operated in a manner similar to that of the rolls employed in roller-galvanizing baths. There is, however, no need for the extra complication in apparatus thus involved. In order, however, that the improved method may be fully understood, I have shown, in the accompanying Fig. 3 is a plan view of the rolls and water baths employed. Figs. 4 and 5 are views corresponding with Figs. 1 and 2, respectively, and showing a modification.

Referring to Figs. 1 and 2, act are a'pair of rolls, one above the other, which are journaled in housings b b, and c is a vessel containing the water bath in which the sheets are stored after being pickled and before being passed between .the rolls ac. Above the rolls a a there is located a perforated water-trough d for distributing water onto the rolls. The trough dis kept supplied with water by a supplypipe e. The pickled sheets are taken from the water bath 0, and after being passed between the rolls a a are stored in water-bath vessels f j; (see Fig. 3,) from which they are removed to the galvanizing-pots. A separate bath f may be employed for each separate galvanizing-pot. Between the rolls a a and water-baths c f f are placed guides g 9, (see Fig. 3,) upon which the sheets are slid toward and from the rolls on their passage therebetween.

In the modification shown in Figs. 4 and 5 the rolls a a and their housingsb b are located within a tank h, which contains the water constituting the water bath. Both of these figures show the water-tank hiu section, and in both the upper portions of the housings b bare broken away for convenience of illustration. The water-level is at such a height that the coacting tangential surfaces of the two rolls a a are submerged. The rolls are driven from a shaft 1 above the water-tank through intermediate spur-wheels 7' lo 1. Troughs m, extending on oppositesides of the rolls, are preferably arranged communicating with the tank h and constructed so as to hold a shallow depth of water. In the shallow water carried by these troughs m are stored the sheets before and after the cold-rolling, so that the sheets are kept under water (and consequently wet) from the time they are immersed therein after being pickled to the time when they are withdrawn therefrom for immersion in the galvanizing-pot. The sheets are passed only once through the rolls in the direction indicated by the arrow.

witnesses.

EDWARD ALBERT DAVIES. Witnesses:

STEPHEN W'ATKINS,

ROBERT M. LISTER.

Having fully described my invention, what 

